8 tablespoons (1 stick, 4 ounces or 113 grams) butter, melted
1 cup (218 grams or 7 3/4 ounces for light; 238 grams or 8 3/8 ounces for dark) brown sugar
1 large egg
1 teaspoon vanilla or 1/2 teaspoon almond extract
Pinch salt
1 cup (4 3/8 ounces or 125 grams) all-purpose flour

Further additions, use one or a combination of:

1/2 to 1 cup chopped nuts, toasting them first for even better flavor
1/2 to 1 cup chocolate chips
1/2 teaspoon mint extract in addition to or in place of the vanilla
1/2 cup mashed bananas
1/4 cup bourbon, scotch or other whiskey; increase the flour by one tablespoon
2 tablespoons of espresso powder with the vanilla
Stir 1/2 cup dried fruit, especially dried cherries, into the prepared batter
Top with a vanilla butter cream or chocolate peanut butter cream frosting